초록 ▼

An electrically driven master cylinder assembly and various vehicle control systems utilizing the master cylinder assembly. Several forms of master cylinder assemblies are disclosed. In the preferred form, the assembly includes an electric DC motor directly coupled to a master cylinder unit with the

An electrically driven master cylinder assembly and various vehicle control systems utilizing the master cylinder assembly. Several forms of master cylinder assemblies are disclosed. In the preferred form, the assembly includes an electric DC motor directly coupled to a master cylinder unit with the central axis of the motor coaxial with the central axis of the bore of the master cylinder, a ball nut is positioned within the housing of the electric motor for rotation with the armature of the motor, and a ball screw is positioned on the axis of the motor and is driven linearly in response to rotation of the armature. The free end of the ball screw engages the piston of the master cylinder so that energization of the motor operates to move the piston of the hydraulic cylinder linearly within the bore of the hydraulic cylinder to discharge fluid from the outlet of the hydraulic cylinder for delivery to a slave cylinder to perform an appropriate vehicle control function such as engagement or disengagement of the vehicle clutch or actuation of the vehicle braking system.

대표청구항 ▼

A master cylinder assembly comprising: (a) an electric motor including a housing and a hollow armature; (b) a hydraulic master cylinder including a housing rigid with said motor housing, a cylinder defining an elongated bore, a piston movable linearly and slidably in said bore, inlet means in said c

A master cylinder assembly comprising: (a) an electric motor including a housing and a hollow armature; (b) a hydraulic master cylinder including a housing rigid with said motor housing, a cylinder defining an elongated bore, a piston movable linearly and slidably in said bore, inlet means in said cylinder for admitting hydraulic fluid into said bore from a reservoir, and an outlet fitting in said cylinder communicating with said bore and operative to convey hydraulic fluid out of said bore for delivery to a slave device in response to linear movement of said piston in said bore; (c) nut means driven by said armature; (d) an annular output shaft defining a bore extending axially therethrough and having a threaded portion threadably engaging said nut means so that rotation of said armature upon energization of said motor linearly advances said output shaft; (e) a first push rod drivingly connected at its outboard end to said piston, having its inboard end disposed within said output shaft bore, and drivingly connected to said output shaft so that said piston is moved linearly in response to linear advancement of said output shaft; and (f) a second push rod having its inboard end disposed within said output shaft bore in juxtaposition to the inboard end of said first push rod and extending at its outboard end out of the end of said output shaft remote from said master cylinder.